Some of these lenses now have a price and release date attached to them.
The 120-300 OS HSM will be available in March for €2799
The 150 macro OS HSM will be available in April for €1225
The 12-24 II HSM will be available in May for €995
http://www.sigmabenelux.com/nieuws

If I missed anything in lenses previously announced and not yet released, please remind me, as I am interested what Sigma has/had on its sleeve so far.